Question

If for a material , Y and B are young's modulus and bulk modulus then:
A)Y<3B B)Y=3B
C)Y>3B D)3Y=B

Answer 1

Answer:

From Hooke's law, young's modulus Y=

Strain

Stress

Thus slope of Stress Vs Strain graph gives the value of Young's modulus of a material.

From the two graphs, we see that slope for material A is greater than for B. Thus material A has greater Young's modulus.

Also, Young's modulus is the measure of strength of the material. Greater the Young's modulus, greater is the force required to produce strain in it. Hence material A is stronger than material B.

Answer 2

Answer:

(A)              

Y/3B= 1-2a

but a,in practice lies between zero and 1/2,so

                           0<1-2a<1

Hence                 Y/3B < 1

or                          Y < 3B

Explanation: